Freescale Semiconductor PXR4030, Reference Manual

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FlexCAN Module
Freescale Semiconductor 24-11
PXR40 Microcontroller Reference Manual, Rev. 1
1 1100 0100 Transmit remote frame unconditionally once. After transmission,
the MB automatically becomes an Rx MB with the same ID.
0 1010 1010 Transmit a data frame whenever a remote request frame with the
same ID is received. This MB participates simultaneously in both
the matching and arbitration processes. The matching process
compares the ID of the incoming remote request frame with the ID
of the MB. If a match occurs this MB is allowed to participate in the
current arbitration process and the Code field is automatically
updated to ‘1110’ to allow the MB to participate in future arbitration
runs. When the frame is eventually transmitted successfully, the
Code automatically returns to ‘1010’ to restart the process again.
0 1110 1010 This is an intermediate code that is automatically written to the MB
by the MBM as a result of match to a remote request frame. The
data frame will be transmitted unconditionally once and then the
code will automatically return to ‘1010’. The CPU can also write
this code with the same effect.
Table 24-6. Message Buffer Code for Tx buffers (continued)
RTR
Initial Tx
code
Code after
successful
transmission
Description